Blow-out patch for pneumatic tires



Patentedv Apr. 2, 1935 UNITED STATES BLovv-oo'rPA'i'enfi-*olt-rivnunmrlcrmns 'charlesv nl. Eckhart, chicago, l

j YDean Hole, Winneika,` Ill.

Aplltfen August s, i934. serial No. 138,269 ffllilrlsV (o1. 15e-26)-hesive. or,l come tandalcovering of readily in-A The present inventionrelates to whatare cornmonly known as blow-out patches ory tire. shoes'used for strengthening the .outer casings of.v pneumatic tires when thesame become perforatedv by ablovv-out or cut, vor becomeweakened fromother causes. Such tire patchesare usually cemented to the. inner Walloity the tire casing` so as to liev between the casing. and the innertube to cover the voper'iing or weakened portion` in the casing,

tacky enough. to secureand' hold the patchto the.

casing in fixed relation because, vif itV Were, .it would .be diicult,not' impossible, to remove the protective coverings previously'proposed. These coverings ,havecommonly been peeled or stripped off whenthe patch isto be used, and if the adhesive i's too tacky thecoveringtears `and must be removed piecemeal, which' requires time andlabor. And if the adhesive is notsu'fliciently tacky, there is atendency for the patch,v when applied to the casing ofA they tire, tocreep along the casing from the position in which it is origienall'yplaced, because relative motion'in one direction is usually set upbetween the casing patch and' the inner tube upon rotation of the'vehicle Wheel upon the` road.

' To overcome the defect of insecure attachment to the casing of thetire, many exp'edients have been proposed, such as providing fasteningde@A Vices of various typesv in addition to" the adhesive cement forholding' the patchl place, butsuch deviceshave been somewhat complicatedand* expensive "to manufacture, and 'have notibeeny Vsuch as `areeasilyV andi quickly applied tothe casing as is desirable. when makingrepairs' on Vthe road. Vacuum cups have also' been proposed, but theymake the .devices more complicated' and expensive to manufacture. L

.With the above noted objections in mind, my invention has for itsprincipal obiect to provide a blow-outpatch Whichmay. be easily and;quickly secured in. position to. the casing of the tire and whichv willbe held Vagainstcreeping'. from. such position when theL casing is in.use on awhel, all

rWithout the use of vacuum cups or extraneous devices tortthat purpose,and by the simple expedient of a better and more tacky cement.

A further object oi the invention is toA provide a blow-out patch havinga coating of suitable ad- Eli-,1 tp. j

fiammable... 'at rial, sl-ich..as','collo'dioiL on, any

cnemicaie'r. other; 'substance which Win entre the f desiredprotection,for theadhesive coating until j tlie' patclif is'used;r and which' issufciently innammableto ,be removed'by .applying a match or othersuitable'ilame'theret f `Vith ""a' readily inflammable covering of lthissort for the adhesivek coating, the problem'of peel-r ing or' strippingpff aA sheet.` ofv Celjlophane, or

equivalent 'material which is not readily infiammabl'e.i s' overcome',and theN adhesivecoating may 'be more' tacky thanlheretofore' possibleIWithout rendering more difficult, if not impossible, the removai ofthe?covering forthejadhesive coating. The use or areadilyinflammablecovering for this coatingfimtil thefpatch is used and theburning oliof this covering byapplicatonoi a match or other flame.`thereto has-"a 4further advantage, v

namely, the heat which is produced in burning-"off this 'coveringheatsfthefadl'resive coating and brings to a-niore 'tacky and bettercondition for adhesion jtothe casing of the tire; "As afresult,ja"regulavulcanizing cement; such asi requires'some heatto makeitsufficiently tacky for use may be employed, and better airesion to thevcasingv of 'the tireisfsecured.

@ther advantageous features will beapparent from the following'description of' the' invention, taken in connecton'fwiththe accompanyingdrawingin'whielr 'Y Figure l" 'isY a5 'cross-sectioA al vievvillustrating y ajt'ire casing mounted on a` Wheel' rim', with myimproved blowout-' .patch securedV in position therein: f Figure 2' ispatch; and

Figuref isr an enlarged cross-sectional View throughthe patch, takenori-the line 3'-'3 of Figure 2 andl showing the manner offapplyinga'matchrorother name for the purpose of burning the Aprotective coveringfrom the adhesive coating- 1' Referring to the drawing, the Wheel rimAis ina topfplanvievvof the blow-out dieeten@ s, tu@ mev casing at 6,'and the blow; 'out patc l i `in,its'entirety at I. Theinner tube of thepneumatic tire isl shown in dotted lines at 8 irrFigure'lzf The bloveoutpatch, as' aV whole, is adisc, preferably-'of yconcave-conv'exform,`}wherebyit F will readily'conform to tl'le'inffer` surface of theThepatclr illustrated inthe draW- ing isysub'stantiallyv circular,V butjit 'may be oval patch may' varywidely within the scope 'fof the present`invention, it' being understood 'thatA the inventionmay ,be v'used.with'any' patch `or equivalent device of the usual or any suitable or pre#ferred construction. The patch `shovvn in the *the mam5 Ybody'porcionofj the In theillustrated embodiment of the invention, the mainbody portion of the patch, indicated i at I0, is of the usual cordconstruction, such as.:v

are formed of old automobile tire casings. These casings are commonlyrun through a slitting ina-l chine which takes off the' remaining treadIand n leaves a strip of cord fabric. This strip of. cord fabric isdie-cut to the desired shapes such, for` example, as the shapeillustrated in Figure 2.r `The upper marginal portion of` the body IGrof the patch 1 is. skivted or beveled so that no,V appreciableshoulderxwill be formedbetween the inner wall of theeicasingvandthegoutler surface ofthe patch' whichmightitendvto pinch or otherwiseinjure the innertube. l" Pg.

The entire convex upperY surfacefof "the, patch body I has appliedthereto a coating l2 'ofzsuitable adhesive or cement. -adhesive orcement is preferably the regularvulcanizing cement, such as requires atleast some heatto bring it to the desired tacky condition, althoughother adhesives or cements are contemplatednwithin the scope of thepresent invention. This adhesive coating I2 is preferably applied to theuppersurface of the patch body I0 in themanufactu're of the patch, and acovering I4 is appliedV over the ,adhesive or cement Vcoating I2Vtopre's e rve such adhesive coating in proper condition, and vtoprevent adhesion ,of the patch to another patch or to other articlesuntil thepatch is ready for use.

.The covering I4 is of any readily inflammable chemical' or othersubstance, such as collodion,

which, as well understood in the art, isV a solution of gun-cottonorpyroxylin in ether and alcohol. `This covering vI4 may be applied byspraying or 'painting itover the entire` upper. adhesive coated YsurfaceI2 of the patch "I, or in any vothersuitable or preferred manner.` Forexample, wherethe vlreadily inflammable covering4 is of Celluloid-likematerial, or other readily inflammable sheet material, `it may beappliedoverrthewupper adhesive coated surface I2 ofthe patchfIin sheetform. The iniiammability ratingof cellophanathe material previouslyused, is about the same as that of paper. This material is combustible,but is not readily inflammable in the sense in which I use thisexpression herein and in the appended claims. If one edge of acellophane covering is lighted, the flame quickly dies out, and thecovering does not .burnoif but must Vbe peeled or stripped from theadhesive coated surface of the patch as above described. y

Collodion, however, is an example of a readily inflammable covering. Ifone edge, or anyportion of this covering I4, is lighted, for. example,with va match, as shownat. I5 inFigure 2, the covering I4 immediatelybursts into flame and burns off of the adhesive coated surface- I2 ofthe patch 'I and leaves this surface I2 exposedfor attachmentof thepatch to the inner surface of the tire casing 6. The covering I4 is thusremoved quickly and expeditiously vin this manner, and at the. same timethe heat `,which is produced in burning off this covering heats theadhesive coating 4I2 and brings it to a highly tacky conditionforadhesionto thetireca'sing 6. And, furthermore, the burning koff ofthis covering III is not accompanied by an undesirable ash or residue.

My invention essentially consists of a pneumatic tire casing patch vofany suitable or preferred construction having its outer side, whichcontacts the inside of the tire casing when the patchis applied, coatedwith an adhesive or cement and covered by a readily inammable coveringwhich may be burned off by applying a match or other suitable name tothis covering. In" the more specific aspects of the invention, theVadhesive or cement is preferably the regular Vulcariizing cement suchas requires some heat to bring it to a good tacky condition but whichhas excellent adhesive properties, and the particular covering for thisadhesive coating is collodion or any other readily inammable chemical orother substance applied by spraying or painting it over the adhesivecoated surface of the patch, or in sheet form, or otherwise as suitableor desired. I claim:

" 1. A blow-out patch for tire casings comprising apatch body having asLu'face for attachment to va tire casing, an adhesive coating on saidsurface,

and a protective covering for said coating, said ,covering being readilyinammable and of a character to burn off without objectionable ash orresidue upon application of a flame thereto.

2. A blow-out patch for tire casings comprising 'a patch body having asurface for attachment to aV tirecasing, an adhesive coating on saidsurface, and a covering of collodion over said coating.

' 3. Av blow-out patch for tire casings comprising a patch body having asurface for attachment to a tire casing, an adhesive coating on saidsurface, said coating consisting of a regular vulcanizing cement such asrequires at least some heat to bring it to the desired tacky condition,and a covering of 'collodion over said coating.

4.'A blow-out patch for tire casings comprising a patch body having asurface for attachment to a tire casing, an adhesive coating on saidsurface, and an actively inflammable second coating over said firstcoating, said second coating being of such character that a flameapplied thereto will be propagated through said second coating with theinner surface thereof substantially unexposed to atmosphere.

5. A` blow-out patch for tire casings comprising a patch body having asurface for attachment to a tire casing, an adhesive coating on saidsurface, said coating consisting of a regular vulcanizing cement such asrequires at least some heat to bring it .to the desired tacky condition,and a second coating of actively inflammable material over said rstcoating, said second coating being of such character that a flameapplied thereto will ,be propagated through said second coating withkthe inner surface thereof substantially unexposed to atmosphere wherebyto burn off said second coating and to heat said first coating uponapplication of a name to said second coating.

6. The method of preparing for application to a tire casing a blow-outpatch having a surface for attachment to said casing, an adhesivecoating on said surface, and an actively inflammable second Vcoatingover said first coating which comprises burning oif said second coatingto expose said first coating and simultaneously to heat said firstcoating to bring it to the desired tacky condition.

' CHARLES D. ECKHART.

